[ STACKOVERFLOW ] format text which match specific pattern showing it only with grep notation and awk notation

format_awk_grep.sh

#!/bin/bash

IFS=$'\n' #line delimiter

#empty your output file
cp /dev/null "$2"

for i in $(cat "$1"); do
	
	is_gin=`echo $i | grep "GIN+"`
	is_lin=`echo $i | grep "LIN+"`
	is_qty=`echo $i | grep "QTY+"`
	is_rff=`echo $i | grep "RFF+"`

	if [ ! -z "$is_gin" ]; then
		#gin=`echo $i | grep -o '[0-9]*'`
		gin=`echo $i | awk 'match($0,/[0-9]{1,}/) {print substr($0,RSTART,RLENGTH)}'`
		newline=0
		linecontent="GIN${gin},"
	elif [ ! -z "$is_lin" ]; then
		#linreq=`echo $i | sed 's/.*++//g' | grep -o '[0-9]*'`
		linreq=`echo $i | sed 's/.*++//g' | awk 'match($0,/[0-9]{1,}/) {print substr($0,RSTART,RLENGTH)}'`
		if [ -z "$linecontent" ]; then
			linecontent="GIN${gin},LIN${linreq},"
		else
			linecontent="${linecontent}LIN${linreq},"
		fi
	elif [ ! -z "$is_qty" ]; then
		#qty=`echo $i | grep -o ':[0-9]*' | sed -e 's/://g'`
		qty=`echo $i | awk 'match($0,/:[0-9]{1,}/) {print substr($0,RSTART,RLENGTH)}' | sed -e 's/://g'`
		linecontent="${linecontent}QTY${qty},"
	elif [ ! -z "$is_rff" ]; then
		#rff=`echo $i  | grep -o '[0-9]*-[0-9]*-[0-9]*'`
		rff=`echo $i  | awk 'match($0,/[0-9]{1,}-[0-9]{1,}-[0-9]{1,}/) {print substr($0,RSTART,RLENGTH)}'`
		linecontent="${linecontent}RFF${rff}"
		echo $linecontent >> "$2"
		linecontent=""
	fi

done

cat $2

input_file.txt

UNB+UNOA:2+5060096369998:14+[BUYER GLN]:14+150310:0105+000023++DESADV'
UNH+0000001+DESADV:D:96A:UN:EAN005'
BGM+351+[INVOICE NUMBER]'
DTM+137:20150309:102'
DTM+11:20150309:102'
DTM+63:20150310:102'
NAD+BY+[BUYER GLN]::9++[BUYER NAME AND ADDRESS]'
NAD+SU+5060096369998::9++GARDNERS BOOKS LTD.+1 WHITTLE DRIVE:WILLINGDON         DROVE:EASTBOURNE+++BN23 6QH+GB'
NAD+DP+[SHIPPING GLN]::9++[SHIPPING NAME AND ADDRESS]'
CPS+1'
PAC+3++PK'
MEA+PD+AAB+KGM:11'
MEA+PD+HT+MMT:460'
MEA+PD+WD+MMT:310'
MEA+PD+LN+MMT:235'
PCI+33E'
GIN+BJ+305060096368359186'
LIN+1++9780006755227:EN'
PIA+1+0006755224:IB'
IMD+F+BST+:::DOGSBODY/JONES, DIANA WYNNE'
QTY+12:1'
RFF+ON:124705572-15-1'
LIN+2++9780007245826:EN'
PIA+1+0007245823:IB'
IMD+F+BST+:::VINTAGE AFFAIR/WOLFF, ISABEL'
QTY+12:3'
RFF+ON:124705572-62-1'
LIN+3++9780007250608:EN'
PIA+1+0007250606:IB'
IMD+F+BST+:::MYSTERY OF THE BLUE TRAIN COMIC STR'
QTY+12:1'
RFF+ON:124705572-48-1'
PAC+3++PK'
MEA+PD+AAB+KGM:11'
MEA+PD+HT+MMT:460'
MEA+PD+WD+MMT:310'
MEA+PD+LN+MMT:235'
PCI+33E'
GIN+BJ+305060096368359193'
LIN+4++9780091950309:EN'
PIA+1+0091950309:IB'IMD+F+BST+:::LOVER/JORDAN, NICOLE'
QTY+12:1'
RFF+ON:124705572-98-1'
LIN+5++9780099453956:EN'
PIA+1+0099453959:IB'IMD+F+BST+:::FLANDERS PANEL/PEREZ-REVERTE, ARTUR'
QTY+12:1'
RFF+ON:124705572-22-1'
LIN+6++9780099481379:EN'
PIA+1+0099481375:IB'
IMD+F+BST+:::MYSTERIOUS FLAME OF QUEEN LOANA/ECO'
QTY+12:2'
RFF+ON:124705572-36-1'
CNT+1:9'
CNT+2:6'
UNT+695+0000001'
UNZ+1+000023'

output.txt

GIN305060096368359186,LIN9780006755227,QTY1,RFF124705572-15-1
GIN305060096368359186,LIN9780007245826,QTY3,RFF124705572-62-1
GIN305060096368359186,LIN9780007250608,QTY1,RFF124705572-48-1
GIN305060096368359193,LIN9780091950309,QTY1,RFF124705572-98-1
GIN305060096368359193,LIN9780099453956,QTY1,RFF124705572-22-1
GIN305060096368359193,LIN9780099481379,QTY2,RFF124705572-36-1